Study Helper records your studying time by subject and blocks access to most obstructions, such as push notifications, games, multimedia, messages, and whatever else might disrupt your task. It's up to you to select which apps you have installed are necesarry for study. The rest of your smartphone will be completely locked for a period of time specified by the user. The application also has a statistics segment that lets one view their study records measured in seconds. Additionally, it provides daily, weekly, and monthly statistics. There's also 'Hard mode' which completely locks the smartphone for a set time, and might not function correctly on all devices.
Helpful as it is, Study Helper might be a bit of a pain in the rear to uninstall from your smartphone. The app requires phone administrator access to operate, and must be unlocked to remove. Look for the ‘phone administrator for deletion' button within its settings, and tap on it before you go about uninstalling the app. Otherwise, the application is easy to use, looks great, and can be used for free.